Very confusing

Would like to say this is good..I just cant. I turn the music off because it is annoying. There is no where to find any explanation of what the different balls do? What do the multi colored balls do? How do you get rid of the lines of "pearls" ? Why do I wan to "buy more pearls"? Stuck on level 10 and can get out of it because I dont know what does what. Can anyone direct me to a place where it give hints or descriptions of what it is all about. Im not stupid. This is just very confusing

Tompek about Bubble Shootix